Table 7.
PSF characteristics for three typical standard stars and several special cases.
| Star | Atmosphere | Instrument mode | PSF parameters | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Name | mR | Date | Seeing | τ0 | vwind | Modea | Filter | nDIT × tDIT | ctn6(0)/106 | Ef10 | FWHM |
| (mag) | Airmass | (″) | (ms) | (m s−1) | ν(AO)/SpF | (s) | (%) | (%) | (mas) | ||
| standard stars | |||||||||||
| HD 183143 | 5.74 | 15-09-18 | 0.73 | 8.3 | 5.2 | P1 pol. | V | 12 × 4 | 0.486 | 28.1 | 25.4 |
| “good” | 1.72 | 1.2 kHz/S | N_R | 12 × 4 | 0.533 | 29.8 | 25.4 | ||||
| N_I | 12 × 4 | 0.548 | 32.4 | 28.4 | |||||||
| HD 129502 | 3.48 | 15-04-19 | 1.20 | 1.4 | 2.2 | P1 pol. | V | 16 × 2 | 0.148 | 14.7 | 43.8 |
| “bad” | 1.06 | 1.2 kHz/M | N_R | 8 × 4 | 0.389 | 20.2 | 25.3 | ||||
| N_I | 16 × 2 | 0.369 | 18.1 | 27.7 | |||||||
| HD 161096 | 1.96 | 15-04-28 | 0.88 | 4.6 | 5.7 | P1 pol | V | 16 × 2 | 0.733 | 36.5 | 22.6 |
| “excellent” | 1.20 | 1.2 kHz/S | N_R | 16 × 2 | 0.919 | 43.5 | 22.5 | ||||
| N_I | 16 × 2 | 0.842 | 41.5 | 25.3 | |||||||
| special cases | |||||||||||
| HD 142527 | 8.3 | 17-06-01 | 0.65 | 11.6 | 1.5 | P2 pol. | VBB | 1 × 3 | 0.196 | 35.1 | 53.8 |
| “low wind effect” | 1.05 | 600 Hz/M | |||||||||
| MMS 12 | 10.5 | 14-10-11 | 1.40 | 2.1 | 3.8 | imaging | I_PRIM | 3 × 40 | 0.039 | 7.0 | 53.1 |
| “faint” | 1.49 | 300 Hz/L | |||||||||
| R Aqr | 8.8b | 14-10-11 | 0.83 | 2.8 | 13.6 | P2 pol. | V | 8 × 10 | 0.091 | 10.5 | 34.1 |
| “red source” | 1.13 | 1.2 kHz/M | Cnt820 | 20 × 1.2 | 0.541 | 41.0 | 28.0 | ||||
| α Eri | 0.49 | 14-10-13 | 1.40 | 1.60 | 3.0 | imaging | CntHa | 50 × 0.01 | 1.02 | 48.2 | 19.3 |
| “snap shot” | 1.25 | 1.2 kHz/S | |||||||||
| α Hya | 2.55 | 14-10-10 | 0.83 | 2.8 | 13.6 | ima | R_PRIM | 10 × 1.1 | 0.798 | 40.5 | 20.5 |
| “coro test source” | 1.36 | 1.2 kHz/M | I_PRIM | 10 × 1.1 | 0.781 | 46.5 | 23.8 | ||||
| VLT diff. limit | V | 5.13 | 91.0 | 14.2 | |||||||
| N_R | 3.80 | 90.6 | 16.8 | ||||||||
| N_I | 2.36 | 86.7 | 21.0 | ||||||||
| H | 0.583 | 76.3 | 41.6 | ||||||||
Notes. The last four lines give the PSF parameters for the calculated, diffraction limited PSFs for the VLT.
ν(AO) is the AO loop frequency and SpF the used spatial filter (S = small, M = medium, L = large) for the WFS
brightness in other bands is mV = 11.4m and mI = 4.4m (Schmid et al. 2017)
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